Safety gripper motion for cylinder presses



July 20 1926.

H. M. BARBER- SAFETY GRIPPER uo'non fioa CYLINDER PRESSES Filed Jan. 22. 1925 INVENTOR ATTORNEYS Patented July 20, 1926.

STATES 1,593,236 PATENT OFFICE.

HOWARD M. BARBER, or srcnrneroii, CONNECTICUT, AssrenoR T 0. B. COTTRELL a sons oonrnnr, or sronrneron, oonnnorronr, A CORPORATION or DELAWARE.

i SAFETY GRIPIEER IYIGTEON FOB CYLINDER PRESSES.

Application filed January 22, 1925. Serial No. 4,012.

During the process of makingready it is customary for the pressman to open the grippers and throw them back into their rotary carrier. The pressman frequently neglects to turn the grippers back before starting the press, thereby causing considerable damage to the parts when the press is started. Also it frequently happens that too much material is crowded under the grippers, thereby preventing them from closing properly, thus holding the tumbler cam out of position to be properly operated by its closing pin and thereby causing considerable damage to the parts from this condition.

The object of my invention is to provide means for avoiding the damage above set forth by providing the gripper tumbler cam with a beveled leading edge and by making the cam actuating pins endwise yielding and by making one of the pins laterally yielding.

A practical embodiment of my invention is represented in the accompanying drawings, in Which- Fig. 1 represents a detail side view of so much of a sheet handling machine as will give a clear understanding of my invention.

Fig. 2 represents a detail plan view of the same.

Fig. 3 represents a detail front view.

Fig. 4: represents a detail section taken in the plane of the line IV of Fig. 2.

A rotary carrier, in the present instance a cylinder 1 is provided with a set of tumbler operated grippers 2, the shaft 3 of which is provided with a tumbler cam 4 hav ing the usual straight groove 5 therethrough for the passage of the cam actuating pins-6 and 7, to be immediately described. This tumbler cam 4 is yieldingly held in either its opened or. closed position by the usual spring means 8 for yieldingly holding the grippers in either their opened or closed positions. The tumbler cam l is provided with a beveled leading edge 9 along one side of the cam groove 5.

The tumbler actuating pin 6 for opening the grippers has a yielding endwise sliding movement in a suitable fixed support 10, a spring 11 serving to yieldingly hold the pin 6 at the limit of its movement into the path of the tumbler cam i.

The tumbler cam actuating pin 7 for 010s ing the grippers has a yielding endwise sliding movement in a rocking support 12,

pivoted at 13 to a fixed support, a spring 1 f being provided for yieldingly holding the pin 7 at the limit of its movement into the path of the tumbler cam. The rocking support 12 has a yielding movement by providing a spring 15 tending to hold the pin 7 at the limit of its bodily lateral movement toward the axis of the rotary carrier 1.

By providing the leading edge of the gripper tumbler cam with the beveled face and by making the cam actuating pins endwise yielding, all damage to the parts, due to the failure of the tumbler cam being replaced in its proper position to cause the cam groove to register with the pins, is avoided, the tumbler cam in its movement causing its beveled leading edge to engage the pin and push it endwise out of the way so that the cam will pass without breaking the cam, the gripper pin or the gripper 7 stand.

Also, by mounting the cam actuating pin which closes the grippers, in a yielding rocking support so that the pin may yield laterally as well as lon itudinally, all damage to the parts, due to tile failure of the tumbler cam being moved to its proper position by the crowding of the material under the grippers to prevent the closing of the grippers, is avoided. In this case as the pin travels along the cam groove, the pin Will be moved laterally away from the axis of the carrier and thus prevent breakage of the parts.

It is evident that various changes may be resorted to in the construction, form and arrangement of the several parts Without departing from the spirit and scope of my invention; hence, I do not intend to be limited to the particular embodiment herein shown and described, but

WVhat I claim is 1. A safety gripper motion including a gripper tumbler cam and an endwise and laterally yielding cam actuating pin.

2. A safety gripper motion including a gripper tumbler cam and cam actuating pins, both being endwise yielding and one being laterally yielding.

3. A safety gripper motion including a gripper tumbler cam and cam actuating pins, one being endwise yielding and the other being laterally yielding.

4:. A safety gripper motion including a gripper tumbler cam having a beveled lead- 110 ing el-gimme lat r-all y'iidjegpagh aetuating pin adapted to be engaged and.

moved out of the ay by said caiii if the 5. A eefiy ripper mean ineiuaing a 6. A safety; gripper intibn inel'uding a gi'ipp'ei' tiinibler earn, an endwise yielding 10 iiiin 'atitiiating pin and a yielding rocking ii port therefbr.

In testimony that I claim the foregeing as rny invention, I have signed my name this 20th day 63E Jhhufiry, I925.

HOVARD M. BARBER. 

